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SECURITIES (Tables) | 6 Months Ended
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Jun. 30, 2022
SECURITIES [Abstract] |
Major Categories of Securities Owned by Entity |
​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​
​ | ​ | June 30, 2022
​ | ​ | ​ | ​ | ​ | Gross | ​ | Gross | ​ | ​ | ​
​ | ​ | Amortized | ​ | Unrealized | ​ | Unrealized | ​ | Fair
(In thousands) |  | Cost |  | Gains |  | Losses |  | Value
Securities available-for-sale: |  | ​ |  |  | ​ |  |  | ​ |  |  | ​ |
Treasury securities | ​ | $ | 247,412 | ​ | $ | — | ​ | $ | (15,532) | ​ | $ | 231,880
Corporate securities | ​ |  | 151,335 | ​ |  | — | ​ |  | (10,139) | ​ |  | 141,196
Pass-through mortgage-backed securities ("MBS") issued by government sponsored entities ("GSEs") | ​ |  | 299,686 | ​ |  | 3 | ​ |  | (22,047) | ​ |  | 277,642
Agency collateralized mortgage obligations ("CMOs") | ​ |  | 357,546 | ​ |  | — | ​ |  | (35,665) | ​ |  | 321,881
State and municipal obligations | ​ | ​ | 37,707 | ​ | ​ | — | ​ | ​ | (2,549) | ​ | ​ | 35,158
Total securities available-for-sale | ​ | $ | 1,093,686 | ​ | $ | 3 | ​ | $ | (85,932) | ​ | $ | 1,007,757
​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​
​ | ​ | June 30, 2022
​ | ​ | ​ | ​ | ​ | Gross | ​ | Gross | ​ | ​ | ​
​ | ​ | Amortized | ​ | Unrecognized | ​ | Unrecognized | ​ | Fair
(In thousands) |  | Cost |  | Gains |  | Losses |  | Value
Securities held-to-maturity: |  | ​ |  |  | ​ |  |  | ​ |  |  | ​ |
Agency notes | ​ | $ | 88,957 | ​ | $ | — | ​ | $ | (9,201) | ​ | $ | 79,756
Corporate securities | ​ | ​ | 5,000 | ​ | ​ | — | ​ | ​ | — | ​ | ​ | 5,000
Pass-through MBS issued by GSEs | ​ | ​ | 287,959 | ​ | ​ | — | ​ | ​ | (26,529) | ​ | ​ | 261,430
Agency CMOs | ​ |  | 198,049 | ​ |  | 328 | ​ |  | (12,693) | ​ |  | 185,684
Total securities held-to-maturity | ​ | $ | 579,965 | ​ | $ | 328 | ​ | $ | (48,423) | ​ | $ | 531,870
​
​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​
​ | ​ | December 31, 2021
​ | ​ | ​ | ​ | ​ | Gross | ​ | Gross | ​ | ​ | ​
​ | ​ | Amortized | ​ | Unrealized | ​ | Unrealized | ​ | Fair
(In thousands) |  | Cost |  | Gains |  | Losses |  | Value
Securities available-for-sale: |  | ​ |  |  | ​ |  |  | ​ |  |  | ​ |
Agency notes | ​ | $ | 82,476 | ​ | $ | — | ​ | $ | (2,222) | ​ | $ | 80,254
Treasury securities | ​ | ​ | 247,916 | ​ | ​ | — | ​ | ​ | (3,147) | ​ | ​ | 244,769
Corporate securities | ​ |  | 148,430 | ​ |  | 4,354 | ​ |  | (754) | ​ |  | 152,030
Pass-through MBS issued by GSEs | ​ |  | 528,749 | ​ |  | 4,271 | ​ |  | (6,566) | ​ |  | 526,454
Agency CMOs | ​ |  | 527,348 | ​ |  | 2,705 | ​ |  | (8,795) | ​ |  | 521,258
State and municipal obligations | ​ | ​ | 39,175 | ​ | ​ | 73 | ​ | ​ | (302) | ​ | ​ | 38,946
Total securities available-for-sale | ​ | $ | 1,574,094 | ​ | $ | 11,403 | ​ | $ | (21,786) | ​ | $ | 1,563,711
​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​
​ | ​ | December 31, 2021
​ | ​ | ​ | ​ | ​ | Gross | ​ | Gross | ​ | ​ | ​
​ | ​ | Amortized | ​ | Unrecognized | ​ | Unrecognized | ​ | Fair
(In thousands) |  | Cost |  | Gains |  | Losses |  | Value
Securities held-to-maturity: |  | ​ |  |  | ​ |  |  | ​ |  |  | ​ |
Pass-through MBS issued by GSEs | ​ | $ | 118,382 | ​ | $ | 59 | ​ | $ | (1,141) | ​ | $ | 117,300
Agency CMOs | ​ |  | 60,927 | ​ |  | — | ​ |  | (873) | ​ |  | 60,054
Total securities held-to-maturity | ​ | $ | 179,309 | ​ | $ | 59 | ​ | $ | (2,014) | ​ | $ | 177,354
Schedule of amortized cost and fair value of debt securities |
​ | ​ | ​ | ​ | ​ | ​ | ​
​ | ​ | ​ | ​ | ​ | ​ |
​ | ​ | June 30, 2022
​ | ​ | Amortized | ​ | Fair
(In thousands) | ​ | Cost | ​ | Value
Available-for-sale | ​ | ​ | ​ | ​ | ​ | ​
Within one year | ​ | $ | 3,904 | ​ | $ | 3,851
One to five years | ​ | ​ | 276,581 | ​ | ​ | 259,282
Five to ten years | ​ | ​ | 150,824 | ​ | ​ | 140,475
Beyond ten years | ​ | ​ | 5,145 | ​ | ​ | 4,626
Pass-through MBS issued by GSEs and agency CMO | ​ | ​ | 657,232 | ​ | ​ | 599,523
Total | ​ | $ | 1,093,686 | ​ | $ | 1,007,757
​ | ​ | ​ | ​ | ​ | ​ | ​
Held-to-maturity | ​ | ​ | ​ | ​ | ​ | ​
Within one year | ​ | $ | — | ​ | $ | —
One to five years | ​ | ​ | 10,000 | ​ | ​ | 9,622
Five to ten years | ​ | ​ | 78,957 | ​ | ​ | 70,134
Beyond ten years | ​ | ​ | 5,000 | ​ | ​ | 5,000
Pass-through MBS issued by GSEs and agency CMO | ​ | ​ | 486,008 | ​ | ​ | 447,114
Total | ​ | $ | 579,965 | ​ | $ | 531,870
Summary of Sale of Available-for-sale Securities |
​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​
​ | ​ | Three Months Ended | ​ | Six Months Ended
​ | ​ | June 30, | ​ | June 30,
(In thousands) |  | 2022 |  | 2021 | ​ | 2022 |  | 2021
Securities available-for-sale | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​
Proceeds | ​ | $ | — | ​ | $ | 3,519 | ​ | $ | — | ​ | $ | 138,077
Gross gains | ​ | ​ | — | ​ | ​ | 20 | ​ | ​ | — | ​ | ​ | 1,327
Tax expense on gains | ​ | ​ | — | ​ | ​ | 7 | ​ | ​ | — | ​ | ​ | 421
Gross losses | ​ | ​ | — | ​ | ​ | — | ​ | ​ | — | ​ | ​ | 120
Tax benefit on losses | ​ | ​ | — | ​ | ​ | — | ​ | ​ | — | ​ | ​ | 38
Sales of Marketable Equity Securities |
​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​
​ | ​ | Three Months Ended | ​ | Six Months Ended
​ | ​ | June 30, | ​ | June 30,
(In thousands) |  | 2022 |  | 2021 | ​ | 2022 |  | 2021
Proceeds: |  | ​ |  |  | ​ |  | ​ | ​ |  |  | ​ |
Marketable equity securities | ​ | $ | — | ​ | $ | — | ​ | $ | — | ​ | $ | 6,101
Gross Unrealized Losses and Fair Value of Investment Securities by Investment Category and Length of Time in a Continuous Unrealized Loss Position |
​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​
​ | ​ | June 30, 2022
​ | ​ | Less than 12 | ​ | 12 Consecutive | ​ | ​ | ​ | ​ | ​ | ​
​ | ​ | Consecutive Months | ​ | Months or Longer | ​ | Total
​ | ​ | Fair | ​ | Unrealized | ​ | Fair | ​ | Unrealized | ​ | Fair | ​ | Unrealized
(In thousands) |  | Value |  | Losses |  | Value |  | Losses |  | Value |  | Losses
Securities available-for-sale: |  | ​ |  |  | ​ |  |  | ​ |  |  | ​ |  |  | ​ |  |  | ​ |
Treasury securities | ​ | $ | 231,880 | ​ | $ | 15,532 | ​ | $ | — | ​ | $ | — | ​ | $ | 231,880 | ​ | $ | 15,532
Corporate securities | ​ | ​ | 138,286 | ​ | ​ | 10,049 | ​ | ​ | 2,910 | ​ | ​ | 90 | ​ | ​ | 141,196 | ​ | ​ | 10,139
Pass-through MBS issued by GSEs | ​ | ​ | 241,079 | ​ | ​ | 16,964 | ​ | ​ | 32,676 | ​ | ​ | 5,083 | ​ | ​ | 273,755 | ​ | ​ | 22,047
Agency CMOs | ​ | ​ | 212,774 | ​ | ​ | 16,090 | ​ | ​ | 108,938 | ​ | ​ | 19,575 | ​ | ​ | 321,712 | ​ | ​ | 35,665
State and municipal obligations | ​ |  | 28,021 | ​ |  | 1,728 | ​ |  | 6,447 | ​ |  | 821 | ​ | ​ | 34,468 | ​ | ​ | 2,549
​
​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​
​ | ​ | December 31, 2021
​ | ​ | Less than 12 | ​ | 12 Consecutive | ​ | ​ | ​ | ​ | ​ | ​
​ | ​ | Consecutive Months | ​ | Months or Longer | ​ | Total
​ | ​ | Fair | ​ | Unrealized | ​ | Fair | ​ | Unrealized | ​ | Fair | ​ | Unrealized
(In thousands) |  | Value |  | Losses |  | Value |  | Losses |  | Value |  | Losses
Securities available-for-sale: |  | ​ |  |  | ​ |  |  | ​ |  |  | ​ |  |  | ​ |  |  | ​ |
Agency notes | ​ | $ | 58,607 | ​ | $ | 1,369 | ​ | $ | 21,647 | ​ | $ | 853 | ​ | $ | 80,254 | ​ | $ | 2,222
Treasury securities | ​ | ​ | 244,769 | ​ | ​ | 3,147 | ​ | ​ | — | ​ | ​ | — | ​ | ​ | 244,769 | ​ | ​ | 3,147
Corporate securities | ​ | ​ | 37,620 | ​ | ​ | 754 | ​ | ​ | — | ​ | ​ | — | ​ | ​ | 37,620 | ​ | ​ | 754
Pass-through MBS issued by GSEs | ​ | ​ | 422,634 | ​ | ​ | 6,333 | ​ | ​ | 4,748 | ​ | ​ | 233 | ​ | ​ | 427,382 | ​ | ​ | 6,566
Agency CMOs | ​ | ​ | 349,879 | ​ | ​ | 8,672 | ​ | ​ | 3,182 | ​ | ​ | 123 | ​ | ​ | 353,061 | ​ | ​ | 8,795
State and municipal obligations | ​ |  | 18,887 | ​ |  | 302 | ​ |  | — | ​ |  | — | ​ | ​ | 18,887 | ​ | ​ | 302

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